The initial degradation of cellulose that initiates microbial growth in the Winogradsky column is carried out by ________.
A. Clostridium
B. cyanobacteria
C. Desulfovibrio
D. Rhodopseudomonas
Answer: A
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Which of the following is true of both T cells and B cells?
A. They are effector cells against specific pathogens. B. They are produced from stem cells of the bone marrow. C. They can help attack and destroy invading pathogens. D. They typically have a short life span. E. All of these statements are true.
Estrogen and testosterone are steroid hormones that differ by only a few atoms. The different receptor binding properties those differences confer allow the hormones to do what during development?
A. Cause differential maturation of the prefrontal cortex during late adolescence. B. Cause a slight increase in muscle mass in females versus males. C. Make females naturally attracted to pink and males to blue. D. Control development of all sex-specific physical traits including sex organs, body hair, and breasts. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about estrogen and testosterone? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
A hypothesis can best be described as a(n):
a. data point b. conclusion c. observation d. tentative explanation e. stepwise problem-solving approach
During prometaphase, the sister chromatids organize into a single row in the center of the cell.
Answer the following statement true (T) or false (F)